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Old 04-29-2014, 02:20 PM   #1
chapinbond's Avatar
Join Date: Aug 2013
Location: Vermont
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Changing Gearing

Jeep - 1989 YJ
Tires- 33"
Gearing Ratio - Still stock I believe. Previous owner didn't know and nothing legible on the Jeep itself
Lift - 3.5"
Engine - 2.5L 4Cyl but upgrading to a V8

What do I need for gearing that will accommodate both the tires and the larger engine?


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Old 04-29-2014, 02:53 PM   #2
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Location: Fishers, IN
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This is a hard question to answer. It would also depend on what trans you are putting in and the ratios there. I believe all 4 cyl came with 4.10s. 4.10s, 33s, and 4 cyl might usually mean regear. But in your case the added power of the v8, the 4.10s and 33s will most likely be perfect.

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Old 04-29-2014, 03:08 PM   #3
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I think 4.10's would probably be as steep as you want with a V-8 and 33's. But the stock axles will not handle that motor. You'll need bigger axles. Probably 60's.
"No matter what anyone says, it's YOUR Jeep, do what YOU want"

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Old 04-29-2014, 04:34 PM   #4
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Exactly what Simonclay pointed out. Gears are the least of your worries if you are going V8 power.

If you are keeping the 4cyl for awhile, then the proper gear for 33" tires would be a 4.88 ratio. Whereas the 4.10s that are in it now would be perfect for the V8, except that the rear axle will not handle the torque of a V8.

The front Dana 30 will be fine as it is, providing that you don't exceed the 33" tire.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...
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Old 04-29-2014, 04:42 PM   #5
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Thanks all these help a lot
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gearing , ratio , tires

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